Biogeochemistry

, Volume 119, Issue 1–3, pp 35–43 | Cite as

A Michaelis–Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments

  • Daniel Cossa
  • Cédric Garnier
  • Roselyne Buscail
  • Francoise Elbaz-Poulichet
  • Nevenka Mikac
  • Nathalie Patel-Sorrentino
  • Erwan Tessier
  • Sylvain Rigaud
  • Véronique Lenoble
  • Charles Gobeil
Article

Abstract

Methylation of mercury (Hg) is the crucial process that controls Hg biomagnification along the aquatic food chains. Aquatic sediments are of particular interest because they constitute an essential reservoir where inorganic divalent Hg (HgII) is methylated. Methylmercury (MeHg) concentrations in sediments mainly result from the balance between methylation and demethylation reactions, two opposite natural processes primarily mediated by aquatic microorganisms. Thus, Hg availability and the activity of methylating microbial communities control the MeHg abundance in sediments. Consistently, some studies have reported a significant positive correlation between MeHg and HgII or total Hg (HgT), taken as a proxy for HgII, in aquatic sediments using enzyme-catalyzed methylation/demethylation mechanisms. By compiling 1,442 published and unpublished HgT–MeHg couples from lacustrine, riverine, estuarine and marine sediments covering various environmental conditions, from deep pristine abyssal to heavily contaminated riverine sediments, we show that a Michaelis–Menten type relationship is an appropriate model to relate the two parameters: MeHg = aHgT/(Km + HgT), with a = 0.277 ± 0.011 and Km = 188 ± 15 (R2 = 0.70, p < 0.001). From Km variations, which depend on the various encountered environmental conditions, it appears that MeHg formation and accumulation are favoured in marine sediments compared to freshwater ones, and under oxic/suboxic conditions compared to anoxic ones, with redox potential and organic matter lability being the governing factors.

Keywords

Mercury Methylmercury Aquatic sediment Methylation Demethylation 

Supplementary material

10533_2013_9924_MOESM1_ESM.pdf (212 kb)
Supplementary material 1 (PDF 213 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Daniel Cossa
    • 1
    • 2
  • Cédric Garnier
    • 3
  • Roselyne Buscail
    • 4
  • Francoise Elbaz-Poulichet
    • 5
  • Nevenka Mikac
    • 6
  • Nathalie Patel-Sorrentino
    • 3
  • Erwan Tessier
    • 3
  • Sylvain Rigaud
    • 7
  • Véronique Lenoble
    • 3
  • Charles Gobeil
    • 8
  1. 1.IFREMERLa Seyne-sur-MerFrance
  2. 2.ISTerreUniversité J. FourierGrenobleFrance
  3. 3.PROTEEUniversité de ToulonLa GardeFrance
  4. 4.CEFREM-CNRS-UMR 5110Université de PerpignanPerpignanFrance
  5. 5.Laboratoire Hydrosciences, UMR CNRSUniversités Montpellier I & IIMontpellier Cedex 5France
  6. 6.Center for Marine and Environmental ResearchRuđer Bošković InstituteZagrebCroatia
  7. 7.CeregeAix-Marseille UniversitéAix-en-Provence Cedex 04France
  8. 8.INRS-ETEUniversité du QuébecQuebecCanada

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